1. At least two water supply sources (sea chests, valves, strainers and pipes) are to be provided and so arranged that one supply source failure will not put all supply sources out of action.

2. For the self-elevating units, the following additional fire water supply measures are to be pro- vided:

(1) Water is to be supplied from sea water main filled by at least two submersible pumping systems. One system failure will not put the other systems out of function, and

(2) Water is to be supplied from drill water system while unit lifting or lowering. Water stored in

the drill water tanks is not less than 40 m plus engine cooling water consumptions before unit lifting or lowering. Alternatively, water may be supplied from buffer tanks in which sea water stored is not less the quantity as the above mentioned.

302. Fire pumps, fire mains, hydrants and hoses

1. At least two independently driven power pumps are to be provided, each arranged to draw directly from the sea and discharge into a fixed fire main. However, in units with high suction lifts, boos- ter pumps and storage tanks may be installed.

2. The arrangements of the pumps, sea suctions and sources of power are to be such as to ensure that a fire in any space would not put both the required pumps out of action.

3. At least one of the required pumps specified in Par 1 is to be dedicated for fire fighting duties and be available for such duties at all times.

4. Every centrifugal pump which is connected to the fire main is to be fitted with a non-return valve.

5. Where either of the required pumps is located in a space not normally manned and is relatively far removed from working areas, suitable means are to be made for remote start-up of that pump and remote operation of associated suction and discharge valves.

6. Except as provided in Par 3, sanitary, ballast, bilge or general service pumps may be accepted as fire pumps, provided that they are not normally used for pumping oil.

7. Each pump is to be capable of delivering at least one jet simultaneously from each of any two fire hydrants, hoses and 19 mm nozzles while maintaining a minimum pressure of 0.35 MPa at any hydrant. In addition, where a foam system is provided for protection of the helicopter deck, the pump is to be capable of maintaining a pressure of 0.7 MPa at the foam installation. If the water consumption for any other fire protection or fire fighting purpose should exceed the rate of the helicopter deck foam installation, this consumption is to be the determining factor in calcu- lating the required capacity of the fire pumps.

8. Each of the fire pumps is to have a capacity appropriate to the fire fighting services supplied from the fire main at the pressure specified in Par 7. Where more pumps than required are installed, their capacity should be to the satisfaction of the Society. In no case is the single pump capacity to be less than 25 m h .

9. Relief valves are to be provided in conjunction with all pumps connected to the fire main if the pumps are capable of developing a pressure exceeding the design pressure of the fire main, hy- drants and hoses. Such valves are to be so placed and adjusted as to prevent excessive pressure in the fire main system.

10. With the required fire pumps operating simultaneously, the pressure maintained in the fire mains is to be adequate for the safe and efficient operation of all equipment supplied therefrom.

11. The fire main is, where practicable, to be routed clear of hazardous areas and be arranged in such a manner as to make maximum use of any thermal shielding or physical protection afforded by the structure of the unit.

12. The fire main is to be provided with isolating valves located so as to permit optimum utilization in the event of physical damage to any part of the main.

13. The fire main is not to have connections other than those necessary for fire fighting purposes.

14. The diameter of the fire main and water service pipes are to be sufficient for the effective dis- tribution of the maximum required discharge from the required fire pumps operating simultaneously.

15. All practical precautions consistent with having water readily available are to be taken to protect the fire main against freezing.

16. Materials readily rendered ineffective by heat are not to be used for fire mains and hydrants un- less adequately protected. The pipes and hydrants should be so placed that the fire hoses may be easily coupled to them.

17. A cock or valve is to be fitted to serve each fire hose so that any fire hose may be removed while the fire pumps are operating.

18. The number and position of the hydrants are to be such that at least two jets of water, not ema- nating from the same hydrant, one of which is to be from a single length of fire hose, may reach

any part of the unit normally engaged in drilling operations.

accessible to those on board while the unit is being navigated or is A hose is to be provided for every hydrant.

19. Fire hoses are to be of non-perishable material approved and to be sufficient in length to project a jet of water to any of the spaces in which they may be required to be used. Each hose is to be provided with a nozzle and the necessary couplings. Hoses specified in this chapter as "fire hoses" are, together with any necessary fittings and tools, to be kept ready for use in conspicuous posi- tions near the water service hydrants or connections. Fire hoses shall have a length of at least 10 m , but not more than:

(1) 15 m

(2) 20 m

(3) 25 m

in machinery spaces;

in other spaces and open decks;and

for open decks with a maximum breadth in excess of 30 m .

20. Size and types of nozzles are to comply with the following requirements.

(1) For the purposes of this chapter, standard nozzle sizes shall be 12 mm , 16 mm and 19 mm or as near thereto as possible. Larger diameter nozzles may be permitted at the discretion of the Society.

(2) For accommodation and service spaces, a nozzle size greater than 12 mm need not be used.

(3) For machinery spaces and exterior locations, the nozzle size shall be such as to obtain the maximum discharge possible from two jets at the pressure mentioned in Par 7 from the small- est pump, provided that a nozzle size greater than 19 mm need not be used.

(4) Nozzles shall be of an approved dual-purpose type (i.e., spray/jet type) incorporating a shutoff.

21. The surface unit is to be provided with at least one international shore connection complying with SOLAS regulation II-2/10-2.1.7. Facilities are to be available enabling such a connection to be used on any side of the unit.

303. Fire extinguishing systems in machinery spaces and in spaces containing fired processes

1. Where main or auxiliary oil-fired boilers and other fired processes of equivalent thermal rating are situated, or in spaces containing oil fuel units or settling tanks, the unit is to be provided with the following:

(1) One of the following fixed fire-extinguishing systems is to be provided.

(A) a fixed pressure water-spraying system

(B) a fixed gas fire-extinguishing system

(C) a fixed high expansion foam installation

Where the machinery space and spaces containing fired processes are not entirely separate, or if fuel oil can drain from the latter spaces into the machinery space, the combined ma- chinery space and fired process space are to be considered as one compartment.

(2) At least two approved portable foam extinguishers or equivalent in each space containing a fired

process and each space in which a part of the oil fuel installation is situated. In addition, at least one extinguisher of the same description with a capacity of 9 for each burner, provided

that the total capacity of the additional extinguisher or extinguishers need not exceed 45 litres for any one space.

(3) A receptacle containing sand, sawdust impregnated with soda, or other approved dry material in such quantity as may be required by the Society. An approved portable extinguisher may be

2. provided as an alternative.

The following arrangements are to be provided in the spaces containing internal combustion machi-

nery used either for main propulsion or for other purposes when such machinery has a total power output of not less than 750 kW .

(1) One of the fixed arrangements required by Par 1.

(2) One approved foam-type extinguisher of not less than 45 capacity or equivalent in every en-

gine space and one approved portable foam extinguisher for each 750 kW of engine power out-

3. put or part thereof. The total number of portable extinguishers so supplied are to be not less than two and need not exceed six.

The Society is to give special consideration to the fire extinguishing arrangements to be provided

4. Where a fire hazard exists in any machinery space for which no specific tinguishing appliances are prescribed in Par 1 to 3, there is to be provided

provisions for fire ex- in, or adjacent to, that

space a number of approved portable fire extinguishers or other means of fire extinction to the sat- isfaction of the Society.

304. Fire extinguishing system on drilling floor

1. The system is to involve two portable fire extinguishers approved by the Society in accordance with Table 10.3. These fire extinguishers are to be of dry chemical type with a capacity of 5 kg or more, or of any other equivalent type.

2. Sufficient manual fire alarms are to be installed at suitable locations throughout the unit.